“95% of those who are monogamous, that is only one sexual partner in their life time — i.e. only their spouse — 95% are still in an intact marriage after the first five years. But for [women] who have had [even] one extra sexual partner other than her husband (almost always prior to marriage) the percent who are still in an intact marriage after the first five years drops to 62% and with two extra partners it drops almost to 50%.”

“… cohabiting couples… report lower levels of closeness, love, and satisfaction… Although women may view cohabitation as a stepping stone to marriage, men tend to see view it as a different and unrelated arrangement.”

“... the proportion of cohabiting couples who are satisfied with their relationships has declined over time even as their numbers have increased. Not so for married couples whose satisfaction level has remained stable.“

Cohabitation & Divorce:

“Couples who cohabit before marriage (and especially before an engagement or an otherwise clear commitment) tend to be less satisfied with their marriages — and more likely to divorce — than couples who do not.”

“When considering living together, men and women often have two different motives or agendas. Women are more apt to view this as the natural phase before marriage — a progression toward, not a test of. Meanwhile, men are more likely to see it, according to researchers, as a test of the relationship — or worse, a way to postpone a commitment. Often without realizing it, women enter into this type of relationship with the same frame of mind she would have as a wife. Instead, she has all the responsibilities and none of the protection of a legal marriage. In a sense, she is demoted to little more than a modern-day concubine.“